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CD-ROM DRIVE AS DIGITAL AUDIO CD-PLAYER

ACD-ROM drive can be used as a stand-alone unit for playing digital audio CDs without interfacing with a computer. The stereo output of CD...

Precision 1Hz clock Generator using Chip-On-Board

Usually the circuits for generation of 1Hz clock for applications in digital clock and counter circuits make use of ICs in conjunction with a...

Variable Power Supply Using a Fixed-Voltage Regulator IC

A voltage regulator (also called a ‘regulator’) with only three terminals appears to be a simple device, but it is in fact a very...

Micro-Power Flasher

With this micro-power flasher you can baffle the intruders trying to break into your home. The unit continuously emits flashing light both during day...

Hearing Aid

This low-cost, general-purpose electronic hearing aid works off 3V DC (2x1.5V battery). In this circuit, transistor T1 and associated components form the audio signal preamplifier...

Briefcase Alarm

This miniature alarm unit protects your valuables from theft by sounding an alarm when somebody attempts to pick up your briefcase. It is a...

Logic high/low Indicator

This logic high/low indicator circuit comprises two ICs. One is hex inverter IC 7404 (IC1) and the other is a bistable multivibrator built around...

Simple Short-Wave Transmitter

This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½ Jgang condenser VC1, which determines the carrier frequency...

Simple Transistor Type and Lead Identifier

A bipolar junction transistor (BJT) has three regions, of which the emitter and the collector are made of the same type of semiconductor (‘n’...

FM Adaptor for Car Stereo

If your car has an FM radio with stereo output but no inbuilt cassette player, this circuit will come handy for listening to your...